JP2008126253A - Apparatus and method for manufacturing seamless tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and a method for manufacturing a seamless tube, for supplying a chemical or the like of the kind and quantity each optimum to the elongation rolling of a hollow tube stock of diversified material during elongation rolling. <P>SOLUTION: The apparatus manufactures the seamless tube by charging the chemical or the like by jetting it with a carrier gas onto the inside surface of the hollow tube stock 5 when performing elongation rolling of the hollow tube stock, wherein a carrier gas tank 1 for storing the carrier gas, a jetting port 2 for jetting a gaseous mixture of the carrier gas and the chemical or the like into the hollow tube stock and a fluid passage 3 for connecting the carrier gas tank with the jetting port are provided. The fluid passage is provided with a chemical or the like charging opening 41 through which the chemical or the like can be charged from the outside into the fluid passage and a closing means 42 for closing the opening. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method and an apparatus for manufacturing a seamless pipe for drawing and rolling a hollow shell, and more particularly, to prevent inner surface flaws that are likely to occur during drawing and rolling, and to provide an inner surface lubricant or hollow shell used for that purpose. Regarding the chemicals for melting or removing the inner scale (hereinafter collectively referred to simply as “medical agents”), it is possible to use the most suitable one for each material of the hollow shell to be drawn and rolled. The present invention relates to a seamless pipe manufacturing apparatus and a manufacturing method thereof.

  As a method of manufacturing a seamless pipe hot, there are a Mannesmann plug mill manufacturing method, a Mannesmann mandrel mill manufacturing method, and a Mannesmann push bench manufacturing method. In these pipe making methods, a process is employed in which a hollow shell is rolled from a solid round billet that is a raw material by hot rolling to produce a seamless pipe.

  As a specific manufacturing process, a solid round billet heated to a high temperature of 1150 ° C. to 1250 ° C. is used as a rolling material, and this round billet is fed to a piercing and rolling machine to make a hole in its axial center. To obtain a thick hollow shell. Next, the obtained hollow shell is fed to one or more kinds of drawing and rolling apparatuses, subjected to thickness processing, and drawn and rolled. After that, it is a process for producing a seamless pipe that becomes a product through a refining process that performs polishing, shape correction, and sizing through a stretch reducer, reeler, sizer, and the like.

  As typical drawing and rolling mills employed in the above-mentioned pipe manufacturing method, there are a second drilling machine, a plug mill and a reeler in the Mannesmann plug mill manufacturing method, and a mandrel mill in the Mannesmann mandrel mill manufacturing method. Usually, in these drawing and rolling machines, seizure between the tool inserted into the inner surface of the hollow shell and the inner surface of the hollow shell, or internal flaws such as scratches due to the scale on the inner surface of the hollow shell tends to occur. For this reason, in order to prevent these inner surface flaws, prior to the drawing and rolling, the agent that exerts the lubricating action and the action of melting or removing the scale, for example, metal salt such as sodium borate or salt, graphite, etc. It may be put into the inner surface of the hollow shell used as the material.

  Conventionally, various methods have been proposed as a method for introducing a drug or the like into the inner surface of a hollow shell. First, in Patent Document 1, as a scale removal method, a scale remover is supplied by compressed gas from one end of a hollow shell, and a residual remover that moves spirally along the inner surface of the hollow shell is sucked from the other end. A method of discharging is proposed.

  In the proposed method, it is difficult to uniformly supply the scale remover to the inner surface of the hollow shell, and further, a lot of chemicals and the like are discharged without being attached to the inner surface of the hollow shell by suction from the other end side. The amount used will increase significantly. And since a chemical | medical agent etc. cannot adhere to a hollow shell inner surface, the adhesion to a hollow shell inner surface becomes non-uniform | heterogenous, and it becomes easy to generate | occur | produce an internal flaw. Moreover, since the scale remover collected on the suction side is mixed with a hollow shell scale or the like, a large capital investment is required to remove these and reuse them.

  Next, in Patent Document 2, as a method of applying the pickling agent to the inner surface of the hollow shell, a pickling agent having a predetermined condition is supplied into the pressure vessel, mixed and pressurized with a gas such as air or nitrogen, and then pressurized. A method is disclosed in which a pickling agent is applied to the inner surface of a hollow shell while being led to a discharge device via an open valve provided in the container and a subsequent transport pipe and circulating, turbulent, laminar or pulsating.

  In Patent Document 3, in an apparatus for supplying a flowable component to the inner surface of a hollow shell, in order to make the adhesion to the inner surface of the hollow shell uniform, it can flow to the tip side of the injection device to the inner surface of the hollow shell. By providing a structure that imparts a twist to the flow of the mixture of the component and the carrier gas, the object is achieved by this twisting motion.

Further, Patent Document 4 discloses a technique that allows a flowable component to uniformly adhere to the inner surface of the hollow shell over the entire length of the hollow shell that has not been solved in Patent Documents 1 to 3 above.
JP 60-64720 A Japanese Patent Publication No. 7-74468 Japanese Patent Publication No. 7-71689 Japanese Patent No. 3633440

  The recent rise in crude oil prices has made it possible to economically develop deep subsea oil fields or oil fields that store high-sulfur crude oil. Oil well pipes used for such oil field development are required to have higher mechanical strength, corrosion resistance, and the like. Examples of the oil well pipe material that satisfies these requirements include 13Cr steel, duplex stainless steel, and high Ni alloys such as Inconel. On the other hand, for example, normal carbon steel is sufficient as the material of the oil well pipe used for developing a low-depth normal quality oil field on the land in the Middle East. Further, there are optimum types and amounts of the medicines corresponding to these materials.

  However, because the number of drawing and rolling mills is limited, the conventional seamless pipe manufacturing equipment is able to supply optimal types and quantities of chemicals to all the hollow shells of each material. It was practically difficult.

  Accordingly, the present invention provides a seamless pipe manufacturing apparatus and a manufacturing method thereof capable of supplying the optimum kind and amount of chemicals and the like for each of the hollow shells of diversified materials during the drawing and rolling. Make things a challenge.

  The present invention will be described below. In order to facilitate understanding of the present invention, reference numerals in the accompanying drawings are appended in parentheses, but the present invention is not limited to the illustrated embodiment.

  In the invention according to claim 1, when the hollow shell (5) is stretched and rolled, the lubricant or the agent for melting or removing the scale of the inner surface of the hollow shell (hereinafter, “ Is a device for producing a seamless pipe by injecting and injecting it with a carrier gas, and a carrier gas tank (1) for storing the carrier gas and a mixture of the carrier gas and the drug in the hollow shell. And a fluid passage connecting the carrier gas tank and the ejection port, and the fluid passage includes a medicine inlet opening (41) through which medicine or the like can be injected into the fluid passage from the outside, and the opening. The above-mentioned problem is to be solved by a seamless pipe manufacturing apparatus (10) provided with a closing means (42) for closing the pipe.

  The invention described in claim 2 is characterized in that, in the seamless pipe manufacturing apparatus according to claim 1, the fluid passage is a pipe (3).

  According to a third aspect of the present invention, there is provided the seamless pipe manufacturing apparatus according to the first aspect, wherein the fluid passage includes a pipe (3) and a medicine input opening (141) formed separately from the pipe. And an opening / closing part (140) including a closing means (142).

  According to a fourth aspect of the present invention, in the seamless pipe manufacturing apparatus according to the third aspect, the opening / closing part (240) is detachably provided on the pipe (3).

  According to a fifth aspect of the present invention, in the seamless pipe manufacturing apparatus according to the third or fourth aspect, a plurality of opening / closing sections (340, 440, 540) are provided.

  According to the sixth aspect of the present invention, when a hollow shell is drawn and rolled, a seamless tube is manufactured in which a drug or the like is injected and injected by a carrier gas through a fluid passage having an injection port located on one inner surface of the hollow shell. A method for producing a seamless pipe, characterized in that, for each hollow shell to be stretch-rolled, a chemical or the like is introduced into a fluid passage and then injected by a carrier gas supplied from the upstream side. The method is intended to solve the problem.

  According to the seamless pipe manufacturing method and the manufacturing apparatus using the same according to the present invention, the optimum kind and amount of chemicals corresponding to each material of the hollow shell are drawn at the inner surface of the hollow shell during stretching and rolling. By supplying to the inner surface, it is possible to effectively prevent the inner surface flaws of the material to be rolled of diversified materials.

  Specific effects corresponding to the invention of each claim are as follows.

  According to the first aspect of the present invention, the fluid passage that connects the carrier gas tank and the injection port includes a medicine introduction opening that can inject the medicine into the fluid passage from the outside, and a closing unit that closes the opening. Therefore, for each hollow tube to be rolled and rolled, a predetermined type and amount of the drug, etc., are introduced into the fluid passage from the drug input opening, and then the opening is closed by the closing means to circulate the carrier gas, so that the drug, etc. is hollow. It can be sprayed on the inner surface of the raw tube.

  According to the second aspect of the present invention, the pipe forms a fluid passage that connects the carrier gas tank and the injection port, and the medicine and the like inlet opening that can inject the medicine into the pipe from the outside and the opening are closed. Because it has a closing means, for each hollow shell to be rolled and rolled, a predetermined type, amount of drug, etc. is introduced into the pipe from the opening of the drug etc., and then the opening is closed by the closing means to circulate the carrier gas, A drug or the like can be injected onto the inner surface of the hollow shell.

  According to the third aspect of the present invention, since the opening / closing part including the medicine opening and closing means is formed separately from the pipe, the pipe and the opening / closing part can be easily manufactured and assembled.

  According to the fourth aspect of the present invention, since the opening / closing part is detachably attached to the pipe, the opening / closing part provided with a chemical or the like is appropriately prepared elsewhere, and the drawn hollow shell The opening / closing part into which the optimum medicine or the like is charged according to the material can be attached to the pipe within a short time.

  According to the fifth aspect of the present invention, since there are a plurality of opening / closing sections, it becomes easy to control the amount of the medicine or the like. Further, if a combination of materials such as medicines that have been put into the respective opening / closing sections is used in combination, mixing is performed in the piping, so that various types of medicines can be handled.

  According to the invention described in claim 6, it is possible to provide a method of manufacturing a seamless pipe capable of supplying an optimal kind and amount of chemicals, etc., to each of the divergent hollow shells at the time of drawing and rolling. it can.

  Such an operation and gain of the present invention will be made clear from the best mode for carrying out the invention described below.

  As described above, in the present invention, for each hollow shell to be stretch-rolled, a diversified material is introduced by injecting a drug or the like into the fluid passage and then injecting a carrier gas supplied from the upstream side. It is an object of the present invention to provide a seamless pipe manufacturing apparatus and a manufacturing method thereof capable of supplying an optimal kind, amount, and the like of each of the hollow base pipes into the hollow base pipe during drawing and rolling. In the present invention, the drug or the like is usually a powder (powder). Further, “when stretching and rolling” as defined in the present invention includes a case where the rolling is performed prior to stretching and a case where the rolling is performed simultaneously.

  The drug or the like targeted by the present invention is applied to a hollow shell made of various dimensions and materials, but in order to effectively exert a lubricating action, a scale melting, or a removal action, depending on the hollow pipe material The type and / or amount must be selected. And, if the kind or amount of the medicine etc. is different, naturally the specific gravity of the medicine etc. and its form (particle size distribution, grain shape etc.) and flowability due to these (for example, clogging in the pipe etc.) ) Will change.

  Therefore, in order to achieve the above-mentioned object efficiently, it is necessary to determine and apply the kind and amount of the drug etc. according to the dimensions of the hollow shell to be stretched and rolled, and the material of the hollow shell. . Furthermore, it is preferable to set the carrier gas injection conditions based on the dimensions of the hollow shell, the material of the hollow shell, the type and amount of the drug, and the like.

  In the present invention, in order to determine and apply the type and amount of the drug etc. according to the dimensions of the hollow shell to be stretch-rolled and the material of the hollow shell, each hollow shell to be stretch-rolled is applied. In addition, a medicine or the like is introduced into the fluid passage, and then injected by the carrier gas supplied from the upstream side.

  The seamless steel pipe manufacturing apparatus of the present invention connects a carrier gas tank for storing a carrier gas, an injection port for injecting an air-fuel mixture of the carrier gas and a chemical into the hollow shell, and the carrier gas tank and the injection port. A fluid passage, and the fluid passage is provided with a medicine inlet opening through which a medicine or the like can be introduced into the fluid passage from the outside and a closing means for closing the opening.

  Here, the fluid passage is usually configured as a pipe. Further, the medicine opening and the closing means for closing the opening may be provided directly on the pipe (first embodiment to be described later), or as an opening / closing part including the opening and the closing means. And may be configured separately (second embodiment to be described later). Furthermore, the opening / closing part may be configured to be detachable from the pipe (third embodiment described later), or a plurality of opening / closing parts may be provided (fourth embodiment described later).

  By changing the flow rate of the medicine or the like into the fluid passage, it is possible to adjust the amount of the medicine or the like per unit area of the inner surface of the hollow shell even if the carrier gas injection pressure is the same. Therefore, by appropriately combining the conditions such as the type of medicine, etc., the input amount, and the injection pressure of the carrier gas, the optimum type, the appropriate amount of medicine, etc. can be supplied without waste, and evenly on the inner surface of the hollow shell. Can be attached.

  The dimension of the hollow shell refers to the inner diameter and the length of the hollow tube. Then, the outer diameter of the inner surface tool that is approximately used for the drawing and rolling, for example, the outer diameter of the plug or the outer diameter of the mandrel bar can be used as the inner diameter of the hollow shell. Or, instead of finely changing the conditions depending on the material, dimensions, and tool dimensions of the hollow shell, grouping the hollow shells in consideration of the representative material of the hollow shell and the outer diameter (rolling setup) For these groups, the type and amount of the drug and the carrier gas injection conditions may be determined. As the carrier gas, for example, air, nitrogen gas or the like is used.

  The jetting pressure of the carrier gas is preferably set to a high pressure because the passage resistance of the gas increases as the length of the hollow shell and the inner diameter of the hollow shell increase. However, if the set pressure is too high, the drug mixed with the gas is discharged from the other end of the hollow shell, and the amount used is increased. On the other hand, if the set pressure is too low, the amount of adhesion to the inner surface of the other end decreases, and there may be a concern about the generation of inner surface flaws. Therefore, it is preferable to set the appropriate injection pressure in accordance with the dimensions of the hollow shell so that the drug or the like adheres to the inner surface of the hollow shell uniformly and without waste. Hereinafter, the present invention will be described based on embodiments shown in the drawings.

(First embodiment)
FIG. 1 is a schematic view showing a part of the manufacturing apparatus according to the first embodiment of the present invention. The seamless pipe manufacturing apparatus 10 includes a carrier gas tank 1 for storing a carrier gas, an injection port 2 for injecting an air-fuel mixture of a carrier gas and a drug into the hollow shell 5, a carrier gas tank 1 and an injection port 2. And a pipe 3 serving as a fluid passage connecting the two. The pipe 3 is provided with an opening / closing part 4 for introducing a drug or the like into the pipe 3 from the outside. In FIG. 1, for convenience, the piping 3 is indicated by lines except for the opening / closing part 4.

  In the manufacturing apparatus 10 of the present invention, the optimum kind and amount of the medicine and the like are determined in accordance with the material and dimensions of the hollow shell tube to be stretched and rolled, and are put into the opening / closing part 4 in advance. . In order to perform this work, as shown in FIG. 2, the opening / closing part 4 has an opening 41 for introducing a medicine, etc., and a closing for closing the opening 41 and making the fluid passage (pipe 3) a closed system. Means 42 are provided. In the manufacturing apparatus 10 of the first embodiment, the opening / closing part 4 forms a part of the pipe, and the opening 41 and the closing means 42 are directly provided in the pipe 3.

  The closing means 42 needs to have a structure that only closes the opening 41 against the pressure of the carrier gas circulated in the pipe 3. In FIG. 2, the closing means 42 is represented as a lid of the opening 41 that is separate from the pipe 3, but in such a shape, at the ends of the four sides of the lid-like closing means 42. It is preferable to provide a seal member or the like for sealing with the piping. Moreover, it is preferable that the closing means 42 is provided with a fixing means that does not float from the pipe when closed. Examples of such fixing means include a fitting structure, a fastening band, and a locking metal fitting.

(Second embodiment)
FIG. 3 is a diagram schematically showing an opening / closing part that is a characteristic part of the seamless pipe manufacturing apparatus according to the second embodiment of the present invention. The illustrated opening / closing part 140 is provided separately from the pipes 3 and 3. The opening / closing part 140 includes a cylindrical part 143, an opening 141 provided in the cylindrical part 143, and a closing unit 142 that closes the opening 141. The left and right ends of the opening / closing part 140 are fixed to the pipes 3 and 3 by welding or providing a flange part.

  The closing means 142 needs to have a structure that only closes the opening 141 against the pressure of the carrier gas flowing in the opening / closing part 140. In FIG. 3, the closing means 142 is represented as a lid of the opening 141 that is separate from the cylindrical portion 143, but in such a shape, the ends of the four sides of the lid-like closing means 142 are provided. In order to seal with piping, it is preferable to arrange a sealing member or the like. Moreover, it is preferable that the closing means 142 is provided with a fixing means that does not float from the pipe when closed. Examples of such fixing means include a fitting structure, a fastening band, and a locking metal fitting. In addition, the description in this paragraph is applied also to 3rd embodiment described below and 4th embodiment by replacing a reference code.

  With this configuration, since the opening / closing part can be manufactured separately from the piping, the degree of freedom in manufacturing the equipment can be increased.

(Third embodiment)
FIG. 4 is a diagram schematically showing an opening / closing part that is a characteristic part of the seamless pipe manufacturing apparatus according to the third embodiment of the present invention. The illustrated opening / closing part 240 is provided separately from the pipes 3 and 3. The opening / closing part 240 includes a cylindrical part 243, an opening 241 provided in the cylindrical part 243, and closing means 242 that closes the opening 241. The pipe main body 30 and the inner pipe 31 are configured in a so-called telescope shape at each end of the left and right pipes 3 and 3 where the opening / closing part 240 is desired from both sides. That is, the outer peripheral surface of the inner pipe 31 is slidable in the direction of the opening / closing part 240 while being in contact with the inner peripheral surface of the pipe body 30. Further, the inner peripheral surface of the cylindrical portion 243 of the opening / closing portion is formed to have the same diameter as the inner peripheral surface of the pipe main body 30. Therefore, the inner pipes 31 and 31 protruding from the pipe main bodies 30 and 30 are inserted into the left and right inner peripheral parts of the cylindrical part 243 without a gap.

  By taking such a configuration, for example, a large number of opening / closing sections are prepared, and each material to be stretch-rolled, chemicals etc. adapted to the shape are enclosed, and each hollow shell to be stretch-rolled from now on A manufacturing method such as attaching an optimal opening / closing part to the pipe is possible.

(Fourth embodiment)
FIG. 5 is a diagram schematically showing an opening / closing part that is a characteristic part of the seamless pipe manufacturing apparatus according to the fourth embodiment of the present invention. The illustrated manufacturing apparatus includes three open / close sections 340, 440, and 540 between the left and right pipes 3 and 3. Further, a joint pipe 31 is disposed between the open / close sections 340 and 440, and a joint pipe 32 is disposed between the open / close sections 440 and 540. As in the third embodiment, an inner pipe is mounted in a telescope shape on the right end side of the pipe 3 on the left side of the drawing, on both sides of the joint pipes 31 and 32, and on the left end side of the pipe 3 on the right side of the drawing. With these configurations, from the left side of the drawing, the pipe 3, the opening / closing part 340, the joint pipe 31, the opening / closing part 440, the joint pipe 32, the opening / closing part 540, and the pipe 3 are connected without any gaps in this order, and the carrier gas can flow. A fluid passage is formed. According to such a configuration, since the opening / closing part is connected to a plurality of pipes, it is possible to deal with a wide range from a large amount to a small amount of chemicals used at the time of stretching. In addition, multiple types of drugs with various performances are prepared and placed separately, and the optimal drug for the material and shape of the hollow shell to be rolled and rolled from now on is appropriately combined and used from a plurality of open / close parts. be able to.

  In addition, in the manufacturing apparatus of 4th embodiment of illustration, although the three opening / closing parts were arrange | positioned in series, you may arrange | position these several opening / closing parts in parallel.

  Next, description of matters common to the above embodiments will be continued.

(Setting injection conditions)
Returning again to FIG. In FIG. 1, a control unit 6 of the manufacturing apparatus 10 is shown in the upper part of the drawing. The control unit 6 includes a rolling information recognition unit 61, an injection condition determination unit 62, and an injection condition adjustment unit 63. The injection condition adjusting unit 63 determines the opening degrees of the valves 7 and 8 provided in the pipes connected to the front and rear of the carrier gas tank 1, and the carrier gas injection conditions are determined.

  Specifically, the dimension of the hollow shell 5 in the rolling information is recognized from the manufacturing schedule information held in advance by the process computer or the measurement result in the manufacturing line. Similarly, the material of the hollow shell 5 is recognized from the manufacturing schedule information held by the process computer or the like, and these data are transmitted to the rolling information recognition unit 61. On the other hand, information on the type of chemicals used for stretching and rolling is also transmitted to the rolling information recognition unit 61 in advance. Furthermore, if necessary, the type of medicine or the like may be transmitted in advance by the operator by operating the device, or automatically selected by a process computer or the like according to the size and material of the hollow shell 5 It is good also as a structure to be made. The rolling information transmitted to the rolling information recognizing unit 61 is transmitted to the injection condition determining unit 62, and the injection conditions that are actually adopted by the set value table, the set value calculation formula, and the like prepared in advance. Specifically, carrier gas injection pressure, injection time, and the like are determined. The injection condition determined by the injection condition determining unit 62 is transmitted to the injection condition adjusting unit 63 in order to realize the injection condition. As shown in FIG. 1, the injection into the hollow shell 5 is performed by the carrier gas supplied from the carrier gas tank 1 through the valve 8 to the pipe 3. That is, the medicine or the like previously charged into the opening / closing part 4 is mixed with the carrier gas in the pipe 3 so as to be wound up by the carrier gas supplied from the carrier gas tank 1 to the pipe 3 at a predetermined pressure. Is injected into the hollow shell 5 from the injection port 2 provided at the tip of the tube.

  The injection condition determined by the injection condition determination unit 62 is reflected as the pressure setting value of the carrier gas in the carrier gas tank 1, and the actual injection work to the hollow shell 5 is performed based on the adjusted injection pressure and injection time. Done.

  Usually, when the carrier gas injection pressure is increased, a large amount of drug or the like adheres to the distal end side (discharge side) of the hollow shell, and when the injection pressure is decreased, the drug or the like tends to adhere to the proximal end side. However, in the case of continuously injecting a drug or the like at a constant injection pressure, the adhesion amount of the drug or the like may vary in the longitudinal direction of the hollow element tube due to the resistance from the wall surface when the gas passes through the inner surface of the hollow element tube. is there. Such uneven adhesion in the longitudinal direction of the hollow shell can be eliminated by sequentially increasing or decreasing the carrier gas pressure during the injection operation. Since the amount of adhesion in the longitudinal direction can be changed according to the change in the injection pressure, the result is uniform adhesion.

  Further, the fluctuation of the injection pressure during the injection operation may be increased and then decreased sequentially, or vice versa. However, a fluctuation method with a sudden pressure change within a short time, generally called a pulsating flow, should be avoided. This is because a smooth gas flow is hindered by an abrupt pressure change, and it is difficult to make the adhesion uniform.

  When spraying a medicine or the like onto the inner surface of the hollow shell, if the hollow shell is rotated, it is effective for reducing the variation in the amount of adhesion in the circumferential direction of the inner surface of the hollow shell and making it adhere uniformly. . That is, even when the injection position of the drug or the like is deviated from the center of the cross section of the hollow shell, the adhesion in the circumferential direction is averaged by the rotation of the hollow shell, and the influence of gravity such as the drug can be eliminated, Furthermore, the chemical | medical agent etc. which adhered to the hollow shell inner surface are urged to flow in the circumferential direction by rotation, so that uniform adhesion and minimization of the usage amount can be further promoted. The hollow element tube may be rotated by disposing the hollow element tube on the rotating roller at the injection position of the medicine or the like.

(Drugs, etc.)
Manufacturing apparatus of the present invention, but are not particularly limited drug or the like used in the manufacturing process, the sodium silicate is usually referred to as borax _{(Na 2 B 4 O 7 ·} 5H 2 O), a metallic soap of stearic A mixture with acid soda is used. Borax is a vitreous powdery substance, and is considered to function as an oxygen blocking agent and an antioxidant for carbon steel and as a glass lubricant for stainless steel at the time of drawing and rolling. Further, sodium silicate powder is used by mixing with borax powder. It is considered that sodium silicate functions so that borax is uniformly dispersed in the hollow shell by violently burning at a high temperature during drawing and rolling.

(Uniform adhesion of chemicals, etc. to the inner surface of the hollow shell)
FIG. 6 is a diagram illustrating a configuration in which the hollow shell is disposed on the rotating roller. The hollow shell 5 is rotated around the tube axis at the position where the medicine or the like is injected by, for example, a plurality of rotary rollers 11 installed in the tube axis direction during the injection of the medicine or the like. At this time, all the rotation rollers 11 may be rotationally driven, some may be rotationally driven, and others may be freely rotated (idle rollers).

  As shown in FIG. 6, the medicine or the like is injected from one end of the hollow shell 5 toward the other end, but in order to effectively use the injection pressure, the injection is performed so that the air tightness of the injection side end can be secured. It is desirable to install the face plate 13 covering the side end integrally with the injection port 2.

  Further, when interference with the injection port 12 becomes a problem when the hollow shell 5 is carried into the injection position, the injection port 12 integral with the face plate 13 is separated from the hollow shell 5 before the start of injection. It is possible to adopt a configuration in which it is retracted to the side (right side in the figure), advanced to the hollow shell immediately before the start of injection, and retracted again after the end of injection. At this time, by installing the face plate 13 integrally, the injection port 2 can be positioned at a fixed position with respect to the hollow shell, so that the effect of making the injection condition constant can also be obtained.

  When it is necessary to transport the hollow shell 5 that has been pierced and rolled by a predetermined distance to the starting position of the next process of drawing and rolling as a layout of the production line, the hollow shell 5 that has been charged with chemicals or the like is transported. Sometimes rotate around the tube axis. Thereby, further uniform adhesion in the circumferential direction of the inner surface of the hollow shell 5 can be realized.

  Usually, when the hollow shell 5 is transported to the starting position of stretch rolling after piercing and rolling, the hollow shell 5 is often transported sideways. In this case, a plurality of translation claws are provided to convey the hollow shell 5 in the lateral direction, and at the same time, the hollow shell 5 is rotated by being transported while being in contact with the skid rail. . In order to ensure the above-mentioned effect due to the rotation of the hollow shell 5 at the time of transport, for example, by rotating and transporting for 1 second or longer, the drug or the like is sufficiently adapted to the inner surface of the hollow shell 5 or reacts with the scale on the inner surface. It is desirable to give enough time to do so.

  7A and 7B are views for explaining a configuration in which a plurality of translation claws are provided to convey the hollow shell 5 in the lateral direction, where FIG. 7A shows a plan view and FIG. 7B shows a side view. As shown in the figure, a plurality of translation claws 17 and skid rails 14 are set in the tube axis direction in parallel with the conveying direction of the hollow shell 5. The interval in the tube axis direction of the installation of the translation claw 17 and the like is appropriately determined according to the length range of the hollow shell 5 to be conveyed. In other words, it is necessary to determine an appropriate interval and the number of installed units so that the hollow shell 5 is not transported obliquely during the lateral transport.

  As shown in FIG. 7, the translation claw 17 is installed on a chain 18 that is actuated by a sprocket 19 that is rotationally driven. The translation claw 17 moves forward while pressing the side surface of the hollow shell 5 to carry out the horizontal conveyance of the hollow shell 5. The number of installed translational claws 17 is appropriately determined depending on the transport distance. For example, even if one translational claw 17 is installed for one chain 18, there is no problem in work, but shortening the rotation distance of the chain 18 shortens the cycle time and prevents damage due to the consumption of related equipment. From this point of view, it is desirable to install a plurality of claws 17 on individual chains.

  On the other hand, the skid rail 14 that is fixedly installed has its upper surface set slightly higher than the chain 18 and comes into contact with the lower surface of the hollow shell 5 that is being transported to rotate the hollow shell 5. In order to prevent wrinkles due to collision between the surface of the hollow shell 5 at the start and end of transport and the transport facility, it is desirable to lower the drive speed of the chain 18 than during transport at the start and end of transport. In order to reduce the impact received by the hollow shell 5 at the transfer start position and the transfer end position, it is also effective to prevent the above-mentioned transfer flaws by installing a guide or the like.

It is the schematic which shows a part of manufacturing apparatus of this invention. It is a figure which shows the opening / closing part of the manufacturing apparatus of 1st embodiment. It is a figure which shows the opening / closing part of the manufacturing apparatus of 2nd embodiment. It is a figure which shows the opening / closing part of the manufacturing apparatus of 3rd embodiment. It is a figure which shows the opening / closing part of the manufacturing apparatus of 4th embodiment. It is a figure explaining the structure which arrange | positions a hollow shell on a rotating roller as an example of an apparatus of this invention. It is a figure explaining the structure which provides a some translation claw as an example of an apparatus of this invention, and conveys a hollow shell in a horizontal direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Carrier gas tank 2 Injection port 3 Piping 4, 140, 240, 340, 440, 540 Opening and closing part 5 Hollow base pipe 6 Control part 7, 8 Valve 10 Seamless manufacturing apparatus 11 Rotating roller 13 Face plate 14 Skid rail 17 Translation claw 18 Chain 19 Sprocket 30 Piping body 31 Inner pipe 41, 141, 241 Opening 42, 142, 242 Closing means 61 Rolling information recognition unit 62 Injection condition determining unit 63 Injection condition adjusting unit 243 Tubular part

Claims (6)

When the hollow shell is drawn and rolled, a lubricant or a chemical for melting or removing the scale on the inner surface of the hollow shell (hereinafter referred to as “medical agent”) is injected and injected with a carrier gas. An apparatus for producing seamless pipes,
A carrier gas tank for storing the carrier gas, an injection port for injecting an air-fuel mixture of the carrier gas and a drug into the hollow shell, and a fluid passage connecting the carrier gas tank and the injection port,
The fluid passage is an apparatus for manufacturing a seamless pipe, which includes a medicine inlet opening through which the medicine or the like can be introduced into the fluid passage from the outside, and a closing means for closing the opening. The seamless pipe manufacturing apparatus according to claim 1, wherein the fluid passage is a pipe. The said fluid channel | path is a manufacturing apparatus of the seamless pipe of Claim 1 provided with piping and the opening-and-closing part containing the said chemical | drug | medicine input opening and closing means formed separately from this piping. The seamless pipe manufacturing apparatus according to claim 3, wherein the opening / closing portion is detachably provided on the pipe. The seamless pipe manufacturing apparatus according to claim 3 or 4, wherein a plurality of the opening / closing sections are provided. When a hollow shell is drawn and rolled, it is a method of manufacturing a seamless tube in which a drug or the like is injected and injected by a carrier gas through a fluid passage having an injection port located on one end inner surface of the hollow shell,
A method for manufacturing a seamless pipe, characterized in that, for each hollow shell to be stretch-rolled, a chemical or the like is introduced into the fluid passage and then injected by a carrier gas supplied from the upstream side.

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